Alloy of copper, tin, and nickel



Patented Feb. 28, 1 928.

RUDOLF OZLBERGER, OF VIENNA, ANSTRIA.

ALLOY OF COPPER, TIN, AND NICKEL.

No Drawing. Application filed March 24, 1927,

My invention relates to an improved alloy of copper, tin and nickel. Two classes of such alloyshave heretofore been proposed. In the one class the percentage of nickel is comparatively high for obtaining a silvery lustre of the alloy; in the other class the percentage of nickel islowabout 1% for inefieasing the strength and hardness of the a 0y. 7

My invention consists in an alloy containing about 7.3% tin, 0.25% nickel, the remainder being pure copper. It has been found by careful experiments that this alloy possesses surprisingly valuable physical and mechanical properties.

If ingots of this alloy are forged down in the heat into bars and the transverse section of such bars is reduced in the cold by suitable forging or working, a material of a thoroughly uniform texture is obtained of which the tensile strength is substantially the same as the limit of elasticity. A

Tests madewith this material have the following minimum numbers:

Tensile strength 54'kilogrammes per square given Serial No. 178,143, and in Austria April 3, 1926.

millimetre, limit of elasticity issubstantially the same, stretching 10%, hardness by the Brinell test 200.

This alloy may be prepared in reverberatory furnace or in a crucible furnace or in an electric melting furnace the charge having the composition above indicated viz: copper 92.45%, tin 7.30%, nickel 0.25% any overheating being avoided and deoxidation being secured by phosphorus copper. The metal bath is left to stand until it has reached the proper temperature for casting. The alloy is run into a chill embedded in moulding clay and is permitted to cool therein.

The ingots are forged down in the heat to bars of any desired transverse section, a further reduction of the transverse section is obtained by suitable working in the cold.

\Vhat I claim is:

An alloy of copper, tin and nickel consisting of about 92.45% of pure copper, 7.3% of tin and 0.25% of nickel.

In testimony whereof I affix my signature.

RUDOLF OZLBERGER.

contraction 50%, v 

